Walkie-Talkie working - Basic Principle behind the radio walkie-talkie

A walkie-talkie is a two-way radio transceiver. It is hand-held and portable and was originally developed for use in the military. It has a half-duplex channel. In other words, only one radio transmits at a time. The downside of using a walkie-talkie is that a lot of people can listen (unlike a mobile phone, on which it is possible to have a private conversation.)
The transmission commences when the push-to-talk switch is pressed. A typical walkie-talkie looks like the handset of a telephone. The antenna of a walkie-talkie sticks out of the top. A walkie-talkie has a built-in speaker which can be heard by the user himself or herself and other people in the immediate vicinity of the user. Hand-held transceivers are used either to communicate between two walkie-talkies or vehicle-mounted stations or base stations.

Solar Energy

Through the centuries, scientists have found innovative ways to harness the power of the sun — from magnifying glasses to steam engines. Converting more solar power into electricity is high on the political agenda in many countries, amid the push to find domestic energy sources that are less polluting than fossil fuels.Despite rapid growth in recent years, solar power accounts for less than 1 percent of electricity use in the United States. Solar power is more entrenched in European countries like Spain and Germany, which have promoted its development with strong incentives called feed-in tariffs that require electric utilities to buy solar power at a high, fixed price. The United States accounted for $1.6 billion of the world’s $29 billion market for solar panels; California is by far the leading solar state.

Robots and AI - Future of the Earth

Robots and Artificial Intelligence:
Artificial intelligence (AI) is arguably the most exciting field in robotics. It's certainly the most controversial: Everybody agrees that a robot can work in an assembly line, but there's no consensus on whether a robot can ever be intelligent.
Like the term "robot" itself, artificial intelligence is hard to define. Ultimate AI would be a recreation of the human thought process -- a man-made machine with our intellectual abilities. This would include the ability to learn just about anything, the ability to reason, the ability to use language and the ability to formulate original ideas. Roboticists are nowhere near achieving this level of artificial intelligence, but they have made a lot of progress with more limited AI. Today's AI machines can replicate some specific elements of intellectual ability.

Computers can already solve problems in limited realms. The basic idea of AI problem-solving is very simple, though its execution is complicated. First, the AI robot or computer gathers facts about a situation through sensors or human input. The computer compares this information to stored data and decides what the information signifies. The computer runs through various possible actions and predicts which action will be most successful based on the collected information. Of course, the computer can only solve problems it's programmed to solve -- it doesn't have any generalized analytical ability. Chess computers are one example of this sort of machine.

M-24 Sniper Rifle - Weapon details

A good sniper can damage enemy’s morale by taking out key personnel. They can stop a unit in its tracks. But for a good sniper a gun with an eagle sight, deadly impact and a monstrous fire power is essential. Today we have rounded up Top 10 Sniper Rifles of all times.

What is a BALLISTIC MISSILE??

The modern ballistic missile is based on a design in use since the German V-2 rocket which the Nazis used during World War II to terrorize and kill the British. But because the warhead used conventional explosives—roughly one ton of TNT—the damage was limited. Nevertheless, ballistic missiles have become both the essential long range artillery of modern warfare, and the means par excellence of exerting international pressure. Much of their current usefulness depends on the current lack of defenses against them.
A ballistic missile can be launched from land, from a silo, from mobile platforms on trucks or trains, from submarine or ship, or from an airplane. The U.S., Russia, the UK, France, and China each also have missiles (SLBMs), that are launched from submarines underwater, at sea, or in port. After launch, a ballistic missiles arches up from one point, and lands at another point. All rockets, from fireworks to massive space launchers, carry both fuel and some form of oxygen. Because they do not burn oxygen from the air, ballistic missiles can fly beyond earth’s atmosphere. Long range ballistic missiles spend a majority of their flight time in the vaccum of space. Short-range ballistic missiles may because they can fly where there is little or no air resistance, they can reach speeds up to 20 or more times the speed of sound—some 15,000 miles per hour (7km/sec)—speeds which allow ballistic missiles to go between continents. A missile is called ballistic because, just as one would throw a ball or spear, the rocket’s engine gives the missile an initial push, after which its flight is affected only by gravity. Ballistic missiles do not fly. They go up, and they come down.